It is really nice to have a consistent user interface for the first time, where my applications and the desktop work and look the same. Having used GTK+ applications on KDE and Mac OS X for many, many years, it's certainly a refreshing experience.

Too many GTK+ apps running in GNOME

On the whole I also prefer the simple design methodology behind a lot of what the GNOME people are doing. Despite Linus Torvald's vocal opposition to it, I believe working hard to make interfaces simpler is an admiral goal.

I've still got KDE 3.5.9 on my Athlon XP desktop, but I guess I could say I'm a GNOME user now. For what it's worth, this is another reason why I love using free and open source software, if I don't like a particular user interface or environment, or I choose to use a another one, it is completely in my power to just slot in a different one. It's fantastic!